This is a staff gage...
This staff gage reads 0.80
March 6, 2014. Heavy rain and a very full Bell Creek caused the lower pond to overflow through the marsh to the north onto the horseshoe pit, surrounding the cell tower, into the roadside ditch along Rhodefer.
March 6, 2014. Jerry (and the ducks) didn't seem to mind the pond water flowing over the trail!
Just east of Petal Lane a flowing ditch contains runoff that originates in western Happy Valley. At times this ditch overflows and floods Silberhorn, following a swale to the northeast, headed toward 7th and beyond.
City crews help clear irrigation lines during storms to avoid flooding on neighboring private property.
This storm grate at E Cobblestone Lane covers the entrance to the siphon built to convey irrigation water under Highway 101. In winter, this conveyance carries mostly storm flows originating from the northwest slope of Burnt Mountain and the lowlands east of River Road.
The next photo shows where these storm flows go next.
The irrigation conveyance in the last photo makes its way past McDonald's and Safeway, under Spruce St. and daylights again in the neighborhood west of 5th Avenue.
This photo shows the limitations of this particular ditch, since it was a common-size storm that caused this high water.
Flooding typically results after persistent heavy rains, a single rare large storm event, or physical obstruction of a stormwater conveyance.
This puddle-lake collects runoff from Seal Street as well as the alley between Washington and Cedar.
Streets, alleys, curbs and gutters are part of the stormwater conveyance system, delivering runoff to catchbasins and infiltration facilities. Lack of adequate infiltration facilities causes this pond.
Sequim is fortunate to have soils that allow rapid infiltration of stormwater in many areas. Infiltration is the best way to handle runoff because it lowers the potential for flooding and associated damage. On the other hand, groundwater quality is at risk if stormwater contaminants get into underlying aquifers.
The section of the Olympic Discovery Trail with an adjacent irrigation ditch along Hendrickson Road is one of the more popular sections for walkers, bikers, etc. Both the City and the irrigation entities have maintenance responsibilities since ditches and pipes function as stormwater conveyances in the wet season. Cooperative agreements are an important tool in the stormwater management toolbox.
This picture shows the roadside ditch on E Hammond between S Brown and Still Roads. This ditch carries runoff mostly from properties outside the City limits, up on the slopes of Bell Hill. The runoff flows into the City along Miller Road, into a ditch headed north, under Brownfield Road and Highway 101 - and discharges onto private property north of the Highway.
Since the City has no stormwater collection system (other than its streets, curbs, and ditches), City regulations require landowners to capture and dispose of stormwater on site without discharge to neighboring property.
When the volume of runoff exceeds the capacity of the stormdrains, drywells, and drainfields - and the infiltration capacity of the ground - they start to back up, as shown in this photo. This is NOT the sewer lines backing up, fortunately, but it is still a problem the City works to address.
The Home Depot corporation contracts with a maintenance provider to inspect its stormwater facilities on a monthly basis. This protects their investment and it also complies with a City code requiring annual inspections of all stormwater facilities, public and private.
The City maintains over 1,000 storm drain catch basins and hundreds of drywells, pipes, infiltration drainfields, and other facilities. Annual maintenance keeps the City's infrastructure resilient and protects the environment.